Abstract：
BACKGROUND:Angiotensin converting enzyme (ACE) inhibitors and angiotensin II AT1-receptor antagonists prolong survival in experimental postischemic heart failure (CHF) in rats. The aim of this study was to investigate whether potential beneficial effects of early and long-term therapy with low doses of captopril or losartan occur in hemodynamics and heart morphometry, as well as in infarct size during establishment of CHF after myocardial infarction. METHODS:Male Wistar rats were subjected to myocardial infarction by left coronary ligation. Subsequently, 24 h after surgery captopril (2.5 mg/kg/day/28 days) or losartan (3 mg/kg/day/28 days) was administered by mini-osmotic pump release. Hemodynamics, infarct size, and heart morphometry were measured in sham, untreated, and treated operated rats. RESULTS:Morphometric and hemodynamic parameters were modified after myocardial infarction indicating hypertrophy of the heart and CHF establishment; however, either captopril or losartan partially avoided hypertrophy. Captopril reverted hemodynamics to sham values, while losartan induced further decrease in systolic blood pressure. Both drugs were able to drastically reduce infarct size produced by myocardial infarction. CONCLUSIONS:Data show that early and chronic therapy with low doses of captopril or losartan prevent CHF establishment, probably by limiting extension of infarcted area after coronary occlusion, and suggest AT1 receptor pathway involvement in this pathology.
journal_name
Arch Med Resjournal_title
Archives of medical researchauthors
Martínez LA,Villalobos-Molina Rdoi
10.1016/S0188-4409(03)00076-6subject
Has Abstractpub_date
2003-09-01 00:00:00pages
357-61issue
5eissn
0188-4409issn
1873-5487pii
S0188-4409(03)00076-6journal_volume
34pub_type
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